package com.atguigu.gulimall.product.web;

import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import com.atguigu.gulimall.product.vo.Catalog2Vo;
import com.sun.org.apache.xml.internal.resolver.CatalogEntry;
import org.redisson.api.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Map;
import java.util.UUID;

@RestController
public class IndexController {
    @Autowired
    CategoryService categoryService;
    @Autowired
    private RedissonClient redisson;
    @Autowired
    private StringRedisTemplate redisTemplate;


    @GetMapping({"/","index.html"})
    public String indexPage(Model model){
        //TODO 1.查出所有的1级分类
        List<CategoryEntity> catalogEntries = categoryService.getLevel1Categorys();
        //视图解析器进行拼串
        model.addAttribute("catagorys",catalogEntries);
        return "index";
    }

    @ResponseBody
    @GetMapping("/index/catalog.json")
    public Map<String,  List<Catalog2Vo>> getCatalogJson(){
        Map<String, List<Catalog2Vo>> catalogJson = categoryService.getCatalogJson();
        return catalogJson;
    }

    @ResponseBody
    @GetMapping("/hello")
    public String hello(){
        //1.获取一把锁，只要锁的名字一样，就是同一把锁
        RLock lock = redisson.getLock("my-lock");
        //2.加锁
        lock.lock();//阻塞式等待 ，默认加的锁都是30S
        //1)锁的自动续期，如果业务超长，运行期间自动给锁续上新的30S，不用担心业务时间长，锁自动过期被删掉
        //2）加锁的业务只要运行完成，就不会给当前锁续期，即使不手动解锁，锁默认在30S后会自动删除
        try {
            System.out.println("加锁成功，执行业务...."+Thread.currentThread().getId());
            Thread.sleep(30000);
        }catch (Exception e){

        }finally {
            //3.释放锁  假设解锁代码没有运行，redisson会不会出现死锁
            System.out.println("释放锁...."+Thread.currentThread().getId());
            lock.unlock();
        }
        return "hello";
    }

    //保证一定能讲到最新数据，修改期间，写说是一个排他锁（互斥锁，独享锁），读锁是一个共享锁。
    //写锁没释放，读锁就必须等待
    //读 + 读 ：相当于无锁，并发读，只会在redis中记录好，所有当前的读锁。他们都会同时加锁成功
    //写 + 读 ：等待写锁释放
    //写 + 写： 阻塞方式
    //读 + 写： 有读锁，写也需要等待
    //只要有写的存在，都必须等待。
    @GetMapping("/write")
    @ResponseBody
    public String writeValue(){
        RReadWriteLock lock = redisson.getReadWriteLock("rw-lock");
        String s = "";
        RLock rLock = lock.writeLock();
        //1.改数据加写锁，读数据加读锁
        rLock.lock();
        try{
            System.out.println("写锁加锁成功..."+Thread.currentThread().getId());
            s = UUID.randomUUID().toString();
            Thread.sleep(30000);
            redisTemplate.opsForValue().set("writeValue",s);
        }catch (Exception e){

        }finally {
            rLock.unlock();
            System.out.println("写锁释放..."+Thread.currentThread().getId());
        }
        return s;
    }

    @GetMapping("/read")
    @ResponseBody
    public String readValue(){
        RReadWriteLock lock = redisson.getReadWriteLock("rw-lock");
        String s = "";
        //加读锁
        RLock rLock = lock.readLock();
        //1.改数据加写锁，读数据加读锁
        rLock.lock();
        try{
            System.out.println("读锁加锁成功..."+Thread.currentThread().getId());
            s = UUID.randomUUID().toString();
            Thread.sleep(30000);
            redisTemplate.opsForValue().get("writeValue");
        }catch (Exception e){

        }finally {
            rLock.unlock();
            System.out.println("读锁释放..."+Thread.currentThread().getId());
        }
        return s;
    }

    /**
     * 车库停车
     * 3车位
     * 信号量也可用作分布式限流
     * @return
     */
    @GetMapping("park")
    @ResponseBody
    public String park() throws InterruptedException {
        RSemaphore park = redisson.getSemaphore("park");
        park.acquire();//获取一个信号，获取一个值,占一个车位
        return "ok";
    }

    @GetMapping("park-try-acquire")
    @ResponseBody
    public String parkTryAcquire() throws InterruptedException {
        RSemaphore park = redisson.getSemaphore("park");
        boolean b = park.tryAcquire();//获取一个信号，获取一个值,占一个车位
        if(b){
            //执行业务
        }else {
            return "error";
        }
        return "ok";
    }

    @GetMapping("go")
    @ResponseBody
    public String go(){
        RSemaphore park = redisson.getSemaphore("park");
        park.release();//释放一个车位
        return "ok";
    }

    /**
     * 闭锁
     * 放假 锁门
     * 1班没人了，
     * 5个班全部走完，我们才可以锁大门
     */
    @GetMapping("lockDoor")
    @ResponseBody
    public String lockDoor() throws InterruptedException {
        RCountDownLatch door = redisson.getCountDownLatch("door");
        door.trySetCount(5);
        door.await();//等待闭锁都完成
        return "放假了...";
    }

    @GetMapping("/gogogo/{id}")
    @ResponseBody
    public String gogogo(@PathVariable("id") Long id){
        RCountDownLatch door = redisson.getCountDownLatch("door");
        door.countDown();//计数减1
        return id + "班的人都走了...";
    }
}
